﻿// Licensed to the Apache Software Foundation (ASF) under one or more
// contributor license agreements.  See the NOTICE file distributed with
// this work for additional information regarding copyright ownership.
// The ASF licenses this file to You under the Apache License, Version 2.0
// (the "License"); you may not use this file except in compliance with
// the License.  You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
namespace Math3.linear
{
    /// <summary>
    /// Default implementation of the <see cref="RealMatrixChangingVisitor"/> interface.
    /// <para>
    /// This class is a convenience to create custom visitors without defining all
    /// methods. This class provides default implementations that do nothing.
    /// </para>
    /// </summary>
    public class DefaultRealMatrixChangingVisitor : RealMatrixChangingVisitor
    {
        /// <inheritdoc/>
        public void start(int rows, int columns,
                          int startRow, int endRow, int startColumn, int endColumn)
        {
        }

        /// <inheritdoc/>
        public double visit(int row, int column, double value)
        {
            return value;
        }

        /// <inheritdoc/>
        public double end()
        {
            return 0;
        }
    }
}